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砖坯在不同的窑炉气氛中焙烧,产品有着不同的颜色.在氧化气氛进行焙烧,得红色制品;在还原气氛下焙烧,得到从灰色到黑色制品.砖坯焙烧后之所以能产生不同的颜色,主要是原料土中含铁化合物变化影响的结果.
The bricks are fired in different kiln atmospheres. The products have different colors. Baking in an oxidizing atmosphere gives red products. Baking in a reducing atmosphere gives gray to black products. The bricks can be fired to produce different colors. It is mainly the result of the influence of iron compounds in raw materials.